Finding the Fourth Proportional to 76,145, 105,078.78 and 42,152.74

Step by Step Solution

1. Step 1: Write the proportion equation
   76,145 : 105,078.78 = 42,152.74 : x
2. Step 2: Convert to fraction form
   76,145/105,078.78 = 42,152.74/x
3. Step 3: Cross multiply
   76,145x = 105,078.78 × 42,152.74
4. Step 4: Simplify right side
   76,145x = 4,429,358,492.86
5. Step 5: Solve for x
   x = 4,429,358,492.86/76,145
6. Step 6: Final answer
   x = 58,170.05